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Proceedings Paper

Low-noise SIS mixers with a parallel array of junctions at submillimeter wavelengths
Author(s): Takashi Noguchi; Sheng-Cai Shi; Hiroyuki Iwashita; Masanori Takeda
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Paper Abstract

A Superconductor-Insulator-Superconductor (SIS) mixer using parallel array of N junctions have been studied. It has been shown by theoretical analysis that the performance of this type of device is excellent and that nearly quantum-limited performance of the mixer can be obtained. It has been demonstrated that the double sideband (DSB) noise temperature of a receiver employing parallel array of twin junctions, which is the most simplest case in the parallel array of N junctions, was approximately 3 to 5 times as large as the quantum limited photon noise up to the gap frequency of Nb (approximately 700 GHz). It has been also shown that the bandwidth performance of parallel junction arrays can be improved significantly with a large number of SIS junctions even if SIS junctions with a relatively low current density or a large (omega) RNCJ product are adopted in the arrays.

Paper Details

Date Published: 3 July 2000
PDF: 9 pages
Proc. SPIE 4015, Radio Telescopes, (3 July 2000); doi: 10.1117/12.390438
Show Author Affiliations
Takashi Noguchi, Nobeyama Radio Observatory (Japan)
Sheng-Cai Shi, Purple Mountain Observatory (China)
Hiroyuki Iwashita, Nobeyama Radio Observatory (Japan)
Masanori Takeda, Graduate Univ. for Advanced Studies/Nobeyama (Japan)

Published in SPIE Proceedings Vol. 4015:
Radio Telescopes
Harvey R. Butcher, Editor(s)

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